Gripper mechanism for printing-machines



Patented Aug. 17, 1886* v UNITED STATES "ATENT OFFICE.

B'ERTHOLD HUBER, OFTAUNTON, MASSACHUSETTS.

GRIPPER MECHANISM FOR PRINTING-MACHINES.

EPECIFICATION forming partof Letters Patent 110,347,487, dated August 17, 1886.

Application filed December 26, 1885. Serial No. 186,813. (No model.)

To aZZ whom it may concern:

Be it known that LBERTHoLD HUBER, of Taunton, in the county of Bristol and State of Massachusetts, have invented a certain new and useful Improvement in the Gripper Mechanism for Printing-llIachines, which improve ment is fully set forth and illustrated in the following specification and accompanying draw ings. Y

My invention relates to that class of printing-presses which have continuously-rotating impression-cylinders, and-in which the sheet is held at its leading'edge against the impression-surface by a number of grippers attached to a rock-shaft journaled in the ends of the impression cylinder and operated by means of a slotted tumbler-cam secured to one end of said rock shaft, the slotted tumbler cam being operated by either fixed or movable studs, according as the cylinder makes one or more revolutions to each impression, which engage the slot in said tumbler-cam. i

The object of my invention is to provide means to prevent the liability of anyof the above-named parts .being fractured,if by carelessness or ignorance the slotted tumbler-cam should be placed in a wrong position before starting the press, thereby making it impossible for the stud to enter the slot in the said cam.

Inv the accompanying drawings I' have shown my invention as applied to a single revolution impression-cylinder.

Figure 1 is an end elevation of the cylinder and attached gripper mechanism. Fig. 2 is a side elevation of the same. Fig. 3 is a section through a stud and part of the frame, showing all the parts of the stud. Fig. 4. is a section showing the hollow spindle of the stud. Fig.5 shows the springstep. Fig. 6 shows the spring-step'stop. Fig. 7 shows the slotted tumbler-cam having its leading side beveled.

The dotted arcs, Fig. 7, show the paths taken by the studs in relation to the tumblercam when said cam is placed in the wrong positions.

In the drawings the several parts are respectively indicated by letters.

In the ends A A of the impression-cylinder A are the bearings for the grippershaft A. On the end of the gripper-shaft A, outside of the cylinder end A is secured the slotted tumbler-cam c, and it is held against 7 its stop 0', when the grippers c are either open or closed, by the coiled spring 0, applied in the usual manner. One side, 0 of the tumbler-cam c is inclined or beveled. (See Fig. 7.) The spindle of the operating, t stud b ismade hollow, and in the cavity is placed the coiled spring I) and the springstep 11 (See Fig. 3.) Near the outside end of said spindle is a notch, e, the depth of which is about one half the diameter of the E spindle, and the length equal to a little more than the thickness of the spring-step stop I). plus the distance that the engaging end of the spindle or stud projects out from the frame toward the cylinder end A In the 7 spring-step b is a notch which fits on the springstep stop I), said stop being fastened to the fraine by a screw-bolt, b

Then the impression-cylinder A revolves in the forward direction indicated by the ar- 7 row, and the tumbler-cam c is in its proper position, the slot in said cam engages the ends of the studs 1), and the grippers are caused to open and close in the usual manner. Should, however, the grippers be left 8 opeawhen they should be closed, or vice versa, then the inclined orbeveled side 0 of the tumbler-cam 0 will strike against the end of the Stud 1), causing it to contract the spring If and slide back into its bearing in 8 the frame until the tumbler-cam chas passed.

I have shown my invention as applied to a continuously rotating impression cylinder, but am aware that it can be applied to an oscillating impression cylinder, in which case it would be advisable to make both sides of the tumbler-cam inclined or beveled.

Having fully described my invention, I claim 1. In a cylinder printing-press, the slotted 9, tumbler-cam having its side inclined or beveled parallel to the slot in said tumbler-cam, in combination with the sliding operatingstuds, substantially as and for the purpose set forth. It

2. In the gripper mechanism of a cylinder printing-press, a slotted tumbler-cam, c, having its side inclined or beveled, in combination with the. sliding operating-studs b, pro vided with hollow spindles, coiled springs b u spring-steps b and spring-step stops Z2, substantially as set forth.

Vitnesses: BERTHOLD HUBER.

W. K. HODGMAN, EDWARD P. COLEMAN. 

